off balance - unaware; off guard
on the go - working or doing something all the time
on pins and needles - nervous; anxious; full of anticipation
on purpose - deliberately; intentionally
on the blink - not working properly;broken
pick up the tab - pay the bill or the cost of something
piece of cake - easy
play by ear - act spontaneously; without planning
pill it off - accomplish
pull one’s leg - make fun of somenoe in a playgul way; make somenoe believe something that is not ture
quite a few - many